Our expert says:
The wall of the vagina is very strong, so it can take some pressure, but yes, if too much pressure is exerted and this is done too quickly, it could potentially tear (of course there are early warning signs in the form of discomfort and then pain first). The rear entry position itself, however, is not usually associated with this unless force is used (this would be the same if you experienced forceful entry from the front). I wonder if perhaps the angle that he is penetrating from is making it painful...perhaps he is entering too shallow and needs to get further underneath you. Try different angles (eg. you on your hands and knees and him kneeling behind you) and if it still doesn't work for you, just let him know that this is not okay with you. You could always try again some other time...
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